[flakiness]

Japanese sugi forests are too dense. I don't think they have the space to lay these logs down.

[mr_toad]

Log slides are potentially lethal in steep areas too. Whole buildings can get demolished if the logs roll down the slope.

[lazide]

A historically common way to clear certain kinds of areas in the US is to drag anchor chains with giant bulldozers. May still work?

[rsynnott]

In this case they're trying to leave broadleaf trees alone, so probably not.